EP 1006400 A3 20030514 - Optical device and fresnel lens sheet
Title (en)
Optical device and fresnel lens sheet
Title (de)
Optische Vorrichtung und Fresnellinsen-Folie
Title (fr)
Dispositif optique et feuille lentille de Fresnel
Publication
Application
Priority
JP 34279598 A 19981202
Abstract (en)
[origin: EP1006400A2] Provided is an optical device through which the angle of light passing and going out has little wavelength dependency and which is well applicable to Fresnel lenses with little coloration of light passing through it. The optical device has a diffraction grating formed on one surface and capable of diffracting rays of light incident thereon, and has a refracting member (e.g., a Fresnel lens) formed on the other surface opposite to the diffraction grating and capable of refracting the diffracted rays of light from the diffraction grating to make the refracted rays of light go out of it, in which the wavelength dependency of the diffractive angle of the main rays diffracted by the diffraction grating compensates for the wavelength dependency of the refractive angle thereof refracted by the refracting member, or that is, the former wavelength dependency is opposite to and cancels out the latter one. <IMAGE>
IPC 1-7
IPC 8 full level
G02B 3/08 (2006.01); G03B 21/62 (2006.01)
CPC (source: EP KR US)
G02B 3/08 (2013.01 - EP KR US); G02B 5/1814 (2013.01 - EP US); G02B 27/4211 (2013.01 - EP US); G03B 21/625 (2013.01 - EP US)
Citation (search report)
- [XY] US 5161057 A 19921103 - JOHNSON KENNETH C [US]
- [XA] US 5619373 A 19970408 - MEYERHOFER DIETRICH [US], et al
- [XY] US 5629799 A 19970513 - MARUYAMA KOICHI [JP], et al
- [A] US 2818765 A 19580107 - FOSTER LEON V
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 1006400 A2 20000607; EP 1006400 A3 20030514; CN 1143142 C 20040324; CN 1261156 A 20000726; KR 100377970 B1 20030329; KR 20000047738 A 20000725; US 6282034 B1 20010828
DOCDB simple family (application)
EP 99123273 A 19991130; CN 99115978 A 19991202; KR 19990053003 A 19991126; US 45177699 A 19991201